Installation and Operation
2018 Microchip Technology Inc.
DS50002815A-page 12
2.3.1.3
PERFORMANCE EVALUATION
The Oscilloscope screen capture in
displays the MIC23656 switching
waveforms during normal operation, when supplied from 5V input at full load (6A).
FIGURE 2-3:
Normal Operation at 1V Output, 6A Load.
FIGURE 2-4:
Efficiency vs. I
OUT
.
2.3.1.4
LOOP GAIN MEASUREMENT
The MIC23656 Evaluation Board provides injection points and a termination resistor
(R4) for AC loop gain measurements. If needed, the value of R4 can be changed to
optimize the injection signal level. Inject the oscillator at J6 through the insulation trans-
former (i.e., across resistor R4) and connect the A (CH1) and B (CH2) channels to TP1
and TP2, respectively, or as indicated by the operating instructions of the particular loop
gain analyzer in use.
SW
5V/div
PG
5V/div
V
OUT
50 mV/div
AC coupled
EN
5V/div
0
10
20
30
40
50
60
70
80
90
100
0.001
0.01
0.1
1
10
Efficiency
(%
)
I
OUT
(A)
V
OUT
= 1.0V
TON[1:0] = 10
V
IN
= 3.3V
V
IN
= 5.0V
V
IN
= 2.5V
